Air bless: useless?

[Sandman]

Here's an alternative air bless:

Minor bless: 25% lightning resistance. So air-4 gives 25%, air-6 gives 50%, air-8 gives 75% amd air-10 100%. This is still limited, but it does open up more tricky tactics. For example, taking air-6 would be enough to ensure a lightning immune sacred army when combined with Storm Warriors.

Major bless: mirror image. This would stack with casted mirror images and the glamour ability, instantly making this bless desirable for air nations.